Surface chemistry of 2D materials is often tailored through noncovalent functionalization strategies to avoid disrupting the electronic structure within the layered 2D material. Obtaining large-area structural control of noncovalently adsorbed molecular films for enhanced monolayer robustness is crucial in the design of novel hybrid materials and devices. Often during the fabrication process, noncovalently functionalized 2D materials are subjected to rigorous solution processing protocols. Langmuir-Schaefer protocols can be used to convert standing phases of amphiphiles on water into horizontally oriented monolayers on 2D materials, with varying degrees of molecular ordering and domain lengths of 100-1000 nm. Here we design and employ a custom-built temperature-controlled stage that enables <i>in situ</i> thermal annealing <b>during</b> Langmuir-Schaefer conversion, routinely transferring domains with edge lengths &gt;10 microns. Monolayers with large highly-ordered polymerized domains were more stable towards vigorous washing with polar and nonpolar solvents. This method suggests utility for large-area structural control in noncovalently functionalizing 2D materials requiring solution processing as part of device fabrication.

Multimicrometer noncovalent monolayer domains on layered materials through thermally controlled Langmuir−Schaefer conversion for noncovalent 2D functionalization

256th National Meeting (2018)

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